###### Table Table A 3-1.5. Representative weather stations by HUC2

HUC2	Value	WBAN	Precip (cm)	Precip Range (cm)	HUC2	Value	WBAN	Precip (cm)	Precip Range (cm)
1	Median	14740	3367	2774 – 3641	13	Median	23044	673	581 – 578
2	Median	13733	3120	2759 – 3629	14	Median	24027	760	661 – 856
3	Median	13874	3870	3019 – 5009	15	Median (1)	03103	585	315 – 915
4	Median	14839	2514	1890 – 3183	15	Highest (2)	23183	1740	1740
5	Median	93814	3151	2650 – 3607	16	Median (1)	24127	628	475 – 877
6	Median	13891	3594	3083 – 4362	16	Highest (2)	24128	1238	1238
7	Median	14933	2525	2091 – 2979	17	Median (1)	24156	928	608 – 1438
8	Median	13964	4641	3992 – 4746	17	Median (2)	24221	3762	1438 – 6291
9	Median	14914	1487	1342 – 1859	18	Median (1)	23232	756	296 – 909
10	Median (1)	14935	1107	838 – 1390	18	Median (2)	23188	1338	909 – 2862
10	Median (2)	24029	1902	1390 – 3282	19	Median (1)	26415	913	347-1215
11	Median (1)	13963	1491	710 – 2220	19	Median (2)	26528	2224	1215-11525
11	Median (2)	23047	3121	2220 – 3875	20	Median (1)	22521	1682	1598 – 3287
12	Median (1)	03927	1861	1141 – 2397	20	Highest (2)	21504	9891	9891
12	Median (2)	13897	2569	2397 – 4359	21	Median	11641	3974	3974

1 WBAN - Weather Bureau Army Navy. The number in parenthesis indicates the median station for the low- precipitation group (1) and the median or highest station for the high-precipitation group (2).

##### 3.1.3.2. Aquatic Habitat Bins

In In response to the National Academy of Sciences (NAS) recommendations, the National Marine Fisheries Service and the Fish and Wildlife Service developed 10 habitat bins (including nine aquatic bins and an aquatic associated terrestrial habitat) for use in the ESA pesticide exposure assessments (Table A 3-1.2). The nine aquatic habitat bins (or water body types) are used in aquatic exposure modeling and intended to represent the range of potential habitats where exposure to aquatic endangered species and designated critical habitat may occur. The bins are linked to the aquatic modeling scenarios (Section 3.1.3.1) and specific species to provide spatially and temporally-relevant estimated exposure concentrations (EEC) for each habitat. The nine aquatic habitat bins are used in the BEs for both Step 1 and Step 2 and will be used for the Biological Opinions in Step 3. Each habitat bin has been developed to represent three general categories: freshwater static waters, freshwater flowing waters, and estuarine/marine waters. For each bin, representative dimensions and flow regimes are defined (Table A 3-1.2). The rationale used to develop each habitat bin is described below.

Terrestrial. Terrestrial habitats include both upland and aquatic-associated habitats. Terrestrial habitats will require separate binning consideration or other analysis and are not addressed further in this document. Terrestrial habitats and exposure are discussed in Section 3.3 of each of the pilot chemical BEs. Aquatic-associated terrestrial habitats are addressed below. Bin 1. 1. Aquatic-associated terrestrial habitats. A number of endangered species utilize habitats that include both aquatic and terrestrial characteristics such as riparian zones, beaches, intertidal zones, intermittent streams, and seasonal wetlands. While estimation of surface water concentrations are relevant to species that utilize these habitats, alternative routes and pathways of exposure are also